JPS5813634A - Preparation of thermosetting resin molding material - Google Patents

Abstract

PURPOSE:To prepare the titled fine resin powder which can be used without pulverization, by heating a resin syrup sprayed under reduced pressure, thereby dehydrating the produced polycondensate. CONSTITUTION:For example, the resin syrup 1 such as urea resin etc. in the syrup tank 2 is preheated with the preheater 5, sent to the spray dehydrator 4 kept to reduced pressure by the vacuum pump 6, and sprayed through the nozzle 7 and at the same time heated with the heater 8 to effect the dehydration of the produced polycondensate. The polycondensate collected to the bottom of the dehydrator 4 is taken out through the outlet 9 such as rotary valve, etc. as resin powder 13. The heater 8 is preferably an infrared lamp, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a thermosetting resin molding material.

Generally, thermosetting resin molding materials are obtained by feeding resin sills into various batch-type or continuous-type vacuum drying areas, where the condensation product is dried, but the conventional drying method is The condensation product after dehydration is rated at 5.5% because the sludge is stored in a tank and then stretched out in a vacuum or in a thin film and dried in good condition. ? 301111 becomes large-diameter granules, and in order to use it as a resin molding material, K has the problem of having to undergo an additional pulverization process.Especially in the case of urea resin, the melting point is after 90'011J. The problem with a crusher is that the heat involved in crushing makes crushing difficult.

This postal service was created in view of the above points, and its main purpose is to produce a thermosetting resin molding material that can obtain small particle size particles of about 0.25 sm or less. The purpose is to provide a method.

The present invention will be described in detail below based on embodiments shown in the figures. The method for producing a thermosetting resin molding material according to the present invention is characterized by spraying a resin film under reduced pressure and heating it to dehydrate the condensation product to obtain a resin powder.

Resin silub (1), for example, in the case of urea resin, is a paste-like liquid that is an initial condensate obtained by reacting real lumaline, urea, and a suitable catalyst, with fillers such as valves mixed therein. In the case of resin, the free ice content is 401111
As shown in the figure, the prepared water is stored in a Shiratzu tank (2) and sent to a spray dehydrator (4)K by a supply pump (s). *WiI Shiratsubu (
1) is preheated by a preheater (hot water) before being sent to the dehydrator 14), and is sprayed from the nozzle (7) at the upper end of the dehydrated 411nl whose interior is depressurized by the vacuum pump (6). ) is dried by the heating of the nine heaters (8) installed around the dehydrator (4), and as a result, the free water is dehydrated to less than 3 tatami and a round polymer is obtained, and the lower part of the dehydrator (4) This condensation product accumulated in
The resin powder (1 chrysanthemum) is extracted from the resin powder (9).The heater (8) mentioned above is only effective as a heater by directly acting on radiant heat or water molecules under reduced pressure, especially in a vacuum. Rounding, an infrared lamp or a high frequency heating device is used.Uria I obtained in this way
Il! The fat powder Fi60mesh or less, that is, the particle size is 0.25a or less, and can be used as a resin molding material as it is without being separately pulverized. The water and solvent that evaporate inside the dehydrator (4) are sucked into a collector (to) such as a funnel or cold trap by the action of the vacuum bong +8) mentioned above, where they are coagulated. After that, it is sent to the flocculation liquid tank (1N) and stored there. In the diagram (I) the vacuum pump 1ttl and the flocculating liquid tank (
11) is a vacuum pump tank installed between the

As described above, the present invention dehydrates the condensation polymer by spraying five pieces of resin under reduced pressure and heating it, so that the condensation polymer is formed in one hole of fine particles in the form of mist. As a result, the particle size of the St fat powder obtained by dehydrating the condensation polymer can be reduced, and it can be used as a resin molding material without going through a separate crushing process. It has the advantage of being usable.

[Brief explanation of the drawing]

The drawings are schematic process diagrams showing one embodiment of the present invention, and (1
) is a resin shiratsubu, 14) is a spray dehydrator, and ◆ is a resin powder. 6 Agent Ben-shi Ishi 1) Choshichi

Claims (1)

[Claims] (1) A method for producing thermosetting fIIIFl & molding material, which comprises spraying resin silub under reduced pressure and heating to dehydrate the condensation product to obtain resin powder.